KR101745971B1

KR101745971B1 - Power Factor Limiting and Nuisance Trip Preventing Earth Leakage Circuit Breaker, and the Method thereof

Info

Publication number: KR101745971B1
Application number: KR1020150078453A
Authority: KR
Inventors: 배수근
Original assignee: 배수근
Priority date: 2015-06-03
Filing date: 2015-06-03
Publication date: 2017-06-27
Also published as: KR20160142565A

Abstract

An electric circuit breaker and its method are disclosed. The earth leakage interrupter according to the embodiment is a video current transformer that detects a vector sum of an AC power line current passing through a magnetic loop and detects an electrical leak current when an electrical leak Circuit, it is possible to prevent a short circuit with a low power factor with a low risk and a circuit breaker with an earth leakage circuit breaker at an instantaneous short circuit such as a lightning surge. In addition, the electric leakage screening apparatus according to the embodiment of the present invention provides a power factor limit and a fault-preventing electric leakage prevention function that are resistant to high surge voltage between power lines.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power factor limiting limiting circuit,

More particularly, the present invention relates to a circuit breaker having a power factor limiting circuit that detects an electric leakage only when a phase difference between a leakage current waveform and an AC power source voltage waveform is within a set range, And an error-prevention-preventing earth-leakage circuit breaker for causing a leakage current to be cut off only when a two-phase current is detected.

Electric current flowing from an electric or electronic device connected to an AC power line or to a line is referred to as a short circuit. Short circuiting can cause electric shock or fire and should be removed to save energy. It is time-consuming to eliminate the deterioration of the insulation resistance which causes a short circuit, the contact of the human body with the line, or the contact with the earth, so it does not help to prevent accidents. Preventing electric shock or fire by blocking the AC power line first Should be. Therefore, if a short circuit is detected, an earth leakage circuit breaker is required to detect the current and shut off the power supply line immediately after exceeding a value considered dangerous.

In such an earth leakage breaker, the leakage current is detected by detecting the remaining current of the current flowing in the power line by the induction coil (video current transformer) magnetically coupled to the power line. The waveform of the detected leakage current is a sinusoidal wave having the same frequency as the waveform of the power supply voltage. If there is a difference in phase between the leakage current and the sine wave of the power supply voltage, the effective amount of leakage current is reduced. The risk of fire or electric shock is due to the leakage current, even if the leakage current depends on the effective component of the leakage current, and how much of the effective component is represented by the power factor that can be interpreted as the cosine of the phase difference between current and voltage .

If there is no phase difference, that is, " 0 degree ", the cosine value is 1, and if it is 60 degrees, it is 0.5. If it is 30 degrees, it is 0.87, and when it is 90 degrees, it becomes " 0 ". Therefore, if the phase difference is small, the power factor of the short circuit becomes close to 1 (100%) and the number of effective components increases, which increases the risk of electric shock or fire. Most of the conventional earth leakage breaker is designed to cut off at a certain leakage current or more regardless of the power factor.

For example, FIG. 1 is a typical circuit diagram of a conventional earth leakage breaker. Referring to FIG. 1, the conventional earth leakage breaker receives a current from a video current transformer 110, amplifies it by a leakage current amplifier 120, compares the amplified current with a reference value, and when the output is higher than a set value, A signal is sent to the solenoid coil 140 and the semiconductor switch (SCR) 150 is turned on with the output thereof, and the solenoid coil 160 is activated to cut off the electrical leak. In such a conventional earth leakage breaker, basically, the waveform of the leakage current operates with the same condition whether there is a phase difference from the power supply voltage waveform or not. Therefore, regardless of the power factor of the leakage current, that is, It will be done.

In a modern electric environment, capacitive coupling to a ground of a power line is increasing because a countermeasure against electromagnetic interference of a device is taken in a computer, a fluorescent lamp, an LED lighting device and other household or industrial appliances. Frequent interception causes the inconvenience that the continuity of the service is degraded.

On the other hand, in the conventional circuit breaker, the circuit breaker is operated against a temporary short circuit such as a lightning surge during a short circuit detected by the video current transformer. This surge current is 30mA, which is detected by the earth leakage breaker and is recognized as a short circuit. The lightning surge current is 3kA, which is more than several thousand times the saturation level of the video converter and other electronic circuits. It is difficult to prevent the interruption due to such a lightning surge current.

In addition, if a high surge voltage is applied between the anode and the cathode even when no voltage is applied to the gate thereof, the semiconductor control rectifier, which is an end electronic device of the earth leakage breaker, can not maintain the off state and turns on, It is difficult to prevent the breakage by the breaker.

SUMMARY OF THE INVENTION The present invention has been made in view of the technical background as described above, and it is an object of the present invention to provide a method and apparatus for detecting a phase difference between a voltage waveform phase and a voltage waveform phase, Provides the function of a power-limiting circuit breaker that operates the circuit breaker above the set current value only for a short circuit. It is also an object of the present invention to simultaneously provide an error prevention circuit breaker function for preventing an earth leakage breaker from operating in an instantaneous short circuit and a high voltage shock such as a lightning surge.

The present invention relates to an AC power source leakage circuit breaker applied to an electric distribution panel or a multi-tap, and more particularly to an AC power source leakage circuit breaker which detects an electric leakage only when the phase difference between a leakage current waveform and an AC power source voltage waveform is within a set range, And an object thereof is to provide a power factor limit and an error preventing electric leakage preventing device and a method of preventing the breaker from operating due to a high voltage impact between power lines.

According to an aspect of the present invention, there is provided a leakage current cutoff apparatus comprising: a leakage current amplifier for receiving a leakage current output from a video current transformer and converting the leakage current into a voltage and amplifying the voltage; A delay detector for receiving the output of the leakage current amplifier and outputting a signal when the output is greater than or equal to the reference value and lower than the set value, and the output is maintained for a predetermined time; A signal passing controller for receiving the output of the delay detector and controlling the square wave to synchronize with the peak value of the power supply voltage rectification waveform; A latch which receives the output of the signal passing controller and drives the gate of the semiconductor controlled rectifier (SCR); A reset semiconductor control rectifier (SCR) driven by a voltage provided by the latch and for initializing and initializing the power of each component; A timer for triggering that each component is powered off and initialized; The gate of the subsequent semiconductor control rectifier for trip is connected to the cathode of the tripping semiconductor control rectifier when there is no signal and the latch output is connected to the gate of the tripping semiconductor control rectifier when there is a signal An analog switch; A semiconductor control rectifier for tripping whose gate connection is controlled by an analog switch; A solenoid coil connected to the anode of the semiconductor control rectifier for trip control to control the earth leakage breaker lever; And

A power supply voltage peak synchronous square wave generator utilizing a power rectification waveform for supplying a power factor limit control signal to the signal passing controller; .

In a preferred embodiment, the electrical leak detector according to the power factor limit includes a power supply for supplying operational power including a bias voltage and a reference voltage of a component constituting the electrical leak detector according to the power factor limit; .

In a preferred embodiment, the electric leakage blocking device according to the power factor limit includes a pulse width controller for adjusting the pulse width of the square wave generator; .

According to another aspect of the present invention, there is provided a leakage current shutdown method using a power factor limit, the method comprising: receiving a leakage current output from a current transformer by a leakage current amplifier; Receiving the output of the leakage current amplifier by the delay detector and outputting a signal when the output is greater than or equal to the reference value and less than the set value and the output continues for a predetermined time; Receiving the output of the delay detector by a signal passing controller and being controlled by a square wave synchronizing with a peak value of a power supply voltage rectification waveform; Receiving the output of the signal passage controller by a latch and driving a gate of a semiconductor controlled rectifier (SCR); Initializing and resetting the power of each component by a reset semiconductor control rectifier (SCR) driven by a voltage provided by the latch; Outputting a one-shot output as a trigger input that the power of each component is turned off by a timer; The gate of the tripping semiconductor control rectifier formed after the analog switch is connected to the cathode of the tripping semiconductor control rectifier when there is no signal, and when there is a signal, the latch output is connected to the trip To a gate of a semiconductor controlled rectifier for the semiconductor; The gate connection being controlled by an analog switch connected to the semiconductor control rectifier for tripping; Controlling an earth leakage breaker lever by a solenoid coil connected to a trip semiconductor control rectifier; And supplying a power factor limit control signal to the signal passing controller by a power supply voltage peak synchronous square wave generator utilizing a power rectification waveform; .

In a preferred embodiment, the step of supplying a power factor limit control signal to the signal passing controller comprises adjusting a pulse width of the square wave generator by a pulse width adjuster; And

Supplying an operation power source including a bias voltage and a reference voltage of a component constituting the electric leakage screening device by a power factor limit; .

The leakage circuit breaker according to the embodiment of the present invention is characterized in that a leakage current of a low power factor having a large difference in phase between a voltage phase and a leakage current is remarkably small, Solve the problem.

In addition, it operates sensitively to instantaneous leakage such as capacitive coupling leakage in the filter circuit for preventing electromagnetic interference of electric and electronic circuits, high frequency noise frequently occurring in the line, surge caused by spark, inductive load, lightning surge, Thereby solving the problem that the circuit breaker is cut off unnecessarily.

In addition, the power factor limit and the error-proof earth leakage breaker according to the present invention have a problem in that the electric leakage circuit breaker operates even when the power factor is low and the electric leakage circuit breaker operates in a momentary short- The problem of harm can be significantly reduced.

1 is a diagram showing a schematic configuration of an earth leakage breaker according to the prior art.
2 is a diagram illustrating a configuration of an earth leakage breaker using a power factor limit according to an embodiment of the present invention.
FIG. 3 is an explanatory diagram of a square wave signal generator according to an embodiment of the present invention, showing a correlation between a power supply voltage, a square wave power supply waveform, and a leakage current power factor.
FIG. 4 is a flowchart illustrating an electrical leak detecting method according to an exemplary embodiment of the present invention. FIG. 4 is a flowchart illustrating an electrical leak detecting method according to an exemplary embodiment of the present invention. FIG. 8 is a diagram for explaining a process of performing a blocking operation.
FIG. 5 is a flowchart illustrating a method of blocking electric leakage according to an embodiment of the present invention.

The present invention relates to an AC power source leakage circuit breaker applied to an electric distribution panel or a multi-tap. In an embodiment of the present invention, a leakage current is detected only when the phase difference between the leakage current waveform and the AC power source voltage waveform is within a set range, The present invention provides an electric leakage preventing device and a method thereof for preventing a circuit breaker from operating due to a high voltage shock between the power lines and the instantaneous electric leakage. More specifically, in an embodiment of the present invention, an earth leakage breaker detects a short circuit by detecting a vector sum of an AC power line current passing through a magnetic loop, and disconnects the AC power line when the leakage current reaches a predetermined value. The power factor limit leakage function by the square wave control device that sends the leakage signal only when the difference of the phase angle of the leakage current is within the set value and the alarm signal to send the blocking signal when receiving two leakage signals continuously by the counter and analog switch. To prevent an erroneous operation due to an instantaneous short circuit.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. And is intended to enable a person skilled in the art to readily understand the scope of the invention, and the invention is defined by the claims. It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. It is noted that " comprises, " or "comprising," as used herein, means the presence or absence of one or more other components, steps, operations, and / Do not exclude the addition.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings.

2 is a diagram illustrating a configuration of an earth leakage breaker using a power factor limit according to an embodiment of the present invention.

2, an earth leakage breaker using a power factor limit according to an embodiment of the present invention includes a leakage current amplifier 215, a delay detector 220, a signal passing controller 225, a latch 230, a semiconductor control rectifier 235 A timer 240, an analog switch 245, a semiconductor control rectifier 250, a solenoid coil 255, a power supply 260, a power supply voltage peak synchronous square wave generator 265 and a pulse width controller 270 .

The earth leakage breaker according to the embodiment of the present invention receives the leakage current of the video current transformer 210 and amplifies the leakage current by the inverting amplifier 215 and transmits the amplified current to the delay detector (integrator and comparator) 220), it is confirmed whether or not the predetermined level value of the electric leakage or the electric leakage has continued for a predetermined time or longer. Thereafter, the leakage current is firstly latched with respect to a leakage current whose voltage and phase difference are within a certain range, that is, the power factor is more than a predetermined value, and the detection section is reset by the primary latch. Thereafter, in the embodiment, the timer 240 is triggered by the reset, and the latch output is transmitted to the trip semiconductor control rectifier 250 which magnetizes the final solenoid drive coil only when the analog switch is operated to continuously detect the short circuit , Causing the earth leakage breaker to perform the shutdown operation. That is, according to the embodiment of the present invention described above, an electrical leak cancellation function for preventing electrical leakage due to a power factor limit and an electrical leakage prevention function for preventing an error can be provided at the same time.

The specific operation of each component provided in the earth leakage breaker according to the power factor limit will be described below. First, the video current transformer 210 detects the remaining current of the current vector sum as a result of passing the AC power line. The leakage current amplifier 215 converts the current output of the video current transformer 210 into a voltage and amplifies it. The bipolar comparator (not shown) outputs a signal when the output of the amplifier is higher than or equal to a reference value set by (+) and (-) and lasts for a certain period of time, and the delay detector 220 continuously outputs the output of the comparator . The signal passing controller 225 is configured between the delay detector 220 and the latch (SCR driver) 230 and generates a square wave signal synchronized with the peak value of the AC power supply line voltage. The signal pass controller 235 receives the output of the delay detector 220 and inputs it to the latch 230 and the latch (SCR driver) 230 drives the gate of the semiconductor controlled rectifier (SCR) do.

The semiconductor control rectifier 235 includes a latch 230 for a trip between the latch 230 and the semiconductor control rectifier 250, a signal passing controller 235, a delay detector and a leakage current amplifier 215 ) Is reset. Thereafter, the timer (one-shot pulse) 240 senses and triggers the reset. According to an embodiment, the analog switch 245 shown in FIG. 2 receives the output of the timer 240 and adds the latch signal to the semiconductor control rectifier (for the trip) 250 only for the duration of the one- can do.

Hereinafter, to facilitate understanding of the present invention, a specific embodiment using the electric leakage preventing device using the power factor limit will be described with reference to FIG. 3 and FIG.

FIG. 3 is an explanatory diagram of a square wave signal generator according to an embodiment of the present invention, showing a correlation between a power supply voltage, a square wave power supply waveform, and a leakage current power factor.

The signal passing controller 225 by the power supply voltage peak-to-peak synchronous square wave generator is the main idea of the present invention. In accordance with the embodiment of the present invention, in synchronization with the full wave rectification (bridge rectification) waveform of the power line voltage, a frequency of 120Hz, which is twice the AC frequency of 60Hz, and a phase angle pulse of twice the phase angle at which the cosine value is a desired power factor Width. In the embodiment, a pass signal is supplied to the power factor limit controller only within a phase angle set before and after the (+) peak of the sinusoidal wave. At this time, the square wave generator can adjust the operating power factor limit of the earth leakage breaker by adjusting the signal passing width by the pulse width adjuster 270 according to the embodiment. Considering the case (b) in which the power factor limit is set to 87% in the embodiment, cos θ = 0.87 and θ = cos ^-1 (0.87) in relation to the phase difference (θ) between the power factor (Pf) ) = 29.54 degrees.

Since the square wave power must be supplied within 45 degrees before and after the peak value, the square wave width of the control signal is 59.08 degrees in phase angle. At AC 60Hz, the period is 1/60 second, i.e., 16.67ms, so the square wave width can be adjusted to 2.8ms, which is about 1/6 of the period.

Referring to FIG. 3, it can be seen that a desired power factor is achieved when a pulse signal is supplied only to a peak power supply voltage multiplied by a power factor in a power supply voltage (+) period.

FIG. 4 is a flowchart illustrating an electrical leak detecting method according to an exemplary embodiment of the present invention. FIG. 4 is a flowchart illustrating an electrical leak detecting method according to an exemplary embodiment of the present invention. FIG. 8 is a diagram for explaining a process of performing a blocking operation.

In principle, the output of the video current transformer 210 becomes negative (-) due to a negative current in view of the neutral line (line grounded on the supply side) of the power supply line. Therefore, the input current is inverted . The leakage current exemplified in Fig. 4 is three waveforms with a peak of the leakage current of 100 when the amplitude is the reference value of 87. Fig. Waveform (1) shown in FIG. 4 has a power factor of 100% without phase difference between power line voltage and leakage current. Waveform (2) has a phase difference of 47.5 degrees and a power factor of 67.8%. Waveform Is a short circuit with a power factor of 0%.

Each leakage waveform has a waveform of 100 compared to the comparison reference value of the bipolar comparator. The waveforms (1) and (2) are detected at the passage operation start time of the signal passing controller by the square wave of the square wave generator and exceed the reference value even after about 1 ms delay time of the delay detector. The leakage current signal is passed and latched.

Waveform (3) is only 15 days after the delay time of the delay detector has passed, so that the electric leak detecting operation is not performed. Here, the latch is a kind of memory element in which the signal is released when the operation power is not applied. The reason why the width of the pulse of the latch waveform is narrow is that the latch is immediately reset.

It can be seen from Fig. 4 that even when the phase difference is caused by the capacitor having the phase difference of -90 degrees, when the power factor is 87% (0.87), the leakage current detection operation is 87% It will do. If the square wave pulse width is adjusted to about 2 ms by adjusting the power factor according to the embodiment of the present invention, the detection operation will be performed at a leakage current due to a pure capacitor, that is, at a leakage current higher than 10 times the reference value Can be predicted.

In the embodiment, once the latch signal is detected, that is, when the electrical leak is detected once, the reset semiconductor control rectifier 235 is initialized while the power of each part of the detection section is turned off. The timer that triggers from this initialization sends a one-shot pulse to turn on the semiconductor control rectifier for trip when a short circuit is detected repeatedly. According to the embodiment, the width of this pulse is set to about 17 ms since it is 60 Hz for one cycle period of the AC power supply. Since the analog switch 245 is controlled by the one-shot pulse in the embodiment, the gate of the trip semiconductor rectifier 250 connected downstream is connected to the latch output which is in the shorted state with the cathode for the temporary leak detection and is detected for the pulse time. If the latch output is repeatedly generated, the semiconductor rectifier 250 is turned on to cut off the earth leakage breaker. Of course, if there is no latch output repeatedly, that is, if it is an instantaneous leakage, it returns to the initial state after the one-shot pulse time has elapsed.

Note that shorting the gate of the semiconductor control rectifier 250 for tripping with the cathode has a role of increasing the surge voltage resistance of the anode by setting the impedance of the gate to '0'. The gate of the semiconductor control rectifier 250 for tripping is opened only to the electrical leak detecting latch which is closed when the temporary electrical leakage is detected, and is repeated.

As a result, as described above, the electric leakage blocking device designed according to the embodiment of the present invention prevents the electric leakage of the low power factor with low risk and the interruption of the electric leakage breaker at the instantaneous leakage such as the lightning surge. In addition, the electric leakage screening apparatus according to the embodiment of the present invention provides a power factor limit and a fault-preventing electric leakage prevention function that are resistant to high surge voltage between power lines.

Hereinafter, the leakage current blocking method according to the present invention will be described in turn. Since the function (function) of the electric leakage prevention method by the power factor limit according to the present invention is essentially the same as the function on the electric leakage preventing device by the power factor limit, the description overlapping with FIG. 2 to FIG. 4 will be omitted.

FIG. 5 is a flowchart illustrating a method of blocking electric leakage according to an embodiment of the present invention.

In step S10, a leakage current outputted from the video current transformer is received by the leakage current amplifier, and the voltage is converted into a voltage and amplified.

In step S15, when the output of the amplified output is received by the delay detector and the output is maintained for a predetermined time or longer when the output is equal to or higher than the reference value, the signal is output.

In step S20, the signal passing controller receives the signal output, and performs a process of controlling the square wave to synchronize with the peak value of the power supply voltage rectification waveform.

In step S25, the square wave output is latched by the latch to drive the gate of the semiconductor controlled rectifier (SCR).

In step S30, the power is turned off by the reset semiconductor control rectifier (SCR) driven by the voltage supplied from the latch in which the gate is driven.

In step S35, a process of inputting a trigger indicating that each component is powered off and initialized by a timer is performed.

In step S40, the analog switch receives the output of the timer based on the trigger input. If there is no signal, the gate of the following semiconductor control rectifier for trip is connected to the cathode thereof. If there is a signal, Connect it to the gate of the rectifier. That is, in step S40, the analog switch controls the gate connection by the gate connection.

In step S45, the gate controlled by the solenoid coil connected to the trip semiconductor control rectifier is connected to the trip semiconductor control rectifier to control the earth leakage breaker lever.

In step S50, the power supply voltage peak synchronous square wave generator performs a process of supplying the power factor limit control signal to the signal passing controller using the power supply rectification waveform.

In addition, according to the embodiment of the present invention, the step S60 may further include a step of adjusting the pulse width of the square wave generator.

As described above, the electric leakage preventive device according to the embodiment of the present invention judges a short circuit with a video current transformer that detects a vector sum of an AC power line current passing through a magnetic loop, and when a short circuit reaches a predetermined value, The electric circuit is constituted by an electronic circuit for operating the solenoid coil, thereby preventing the leakage current of the low-power factor low-risk and the instantaneous short-circuit such as the lightning surge. In addition, the electric leakage screening apparatus according to the embodiment of the present invention provides a power factor limit and a fault-preventing electric leakage prevention function that are resistant to high surge voltage between power lines.

Meanwhile, the above-described electric leakage prevention method according to the embodiment of the present invention can be implemented as a computer-readable code on a computer-readable recording medium. The computer-readable recording medium includes all kinds of recording media storing data that can be decoded by a computer system. For example, there may be a ROM (Read Only Memory), a RAM (Random Access Memory), a magnetic tape, a magnetic disk, a flash memory, an optical data storage device and the like. The computer-readable recording medium may also be distributed and executed in a computer system connected to a computer network and stored and executed as a code that can be read in a distributed manner.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Therefore, the scope of the present invention should not be limited by the illustrated embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

Claims

A leakage current amplifier for receiving a leakage current output from the video current transformer and converting the voltage to a voltage and amplifying the voltage;
A bipolar comparator for outputting a signal when the output of the leakage current amplifier is higher than or equal to a reference value set by (+) and (-) and lasts for a predetermined time;
A delay detector for receiving the output of the leakage current amplifier and outputting a signal when the output is equal to or higher than a reference value and lower than a set value and the output continues for a predetermined time;
A signal passing controller for receiving the output of the delay detector and controlling the square wave to synchronize with the peak value of the power supply voltage rectified waveform;
A latch for receiving the output of the signal passing controller and driving a gate of a semiconductor controlled rectifier (SCR);
A reset semiconductor control rectifier (SCR) driven by a voltage provided by the latch, for initializing and initializing the power of each component;
A timer for receiving as a trigger input that the power of each of the components is turned off and initialized;
The gate of the subsequent semiconductor control rectifier for trip is connected to the cathode of the tripping semiconductor control rectifier when there is no signal and the latch output is connected to the gate of the tripping semiconductor control rectifier when there is no signal, An analog switch for connecting to the main body;
A trip semiconductor control rectifier whose gate connection is controlled by the analog switch;
A solenoid coil connected to the trip semiconductor control rectifier for controlling the earth leakage breaker lever;
A power supply voltage peak synchronous square wave generator utilizing a power rectification waveform for supplying a power factor limit control signal to the signal passage controller;
A power supply for supplying operating power including a bias voltage and a reference voltage of the components constituting the electric leakage screening device by the power factor limit; And
And a pulse width adjuster for adjusting the pulse width of the square wave generator and supplying the pulse signal only at a voltage higher than a voltage obtained by multiplying the peak power supply voltage by the power factor in a power supply voltage (+) period.

delete

Receiving a leakage current outputted from a video current transformer by a leakage current amplifier, converting the voltage into a voltage and amplifying the voltage;
Emitting a signal when the amplified output is above or below a reference value set by (+) and (-) and lasts for a predetermined time;
A step of outputting a signal when the output of the leakage current amplifier is received by the delay detector and the output continues for a predetermined time when the output is equal to or higher than the reference value and lower than the set value;
Receiving the output of the delay detector by a signal passing controller and being controlled by a square wave synchronizing with a peak value of a power supply voltage rectification waveform;
Receiving the output of the signal passage controller by a latch and driving a gate of a semiconductor controlled rectifier (SCR);
Turning off and initializing power of each component by a reset semiconductor control rectifier (SCR) driven by a voltage provided by the latch;
Triggering that each component is powered off and initialized by a timer;
The gate of the tripping semiconductor control rectifier constituted after the analog switch is connected to the cathode of the tripping semiconductor control rectifier when there is no signal, and when there is a signal, the latch output To the gate of the semiconductor control rectifier for tripping;
The gate connection being controlled by the analog switch connected to the trip semiconductor control rectifier;
Controlling the earth leakage breaker lever by a solenoid coil connected to the trip semiconductor control rectifier; And
Supplying a power factor limit control signal to the signal passage controller by a power supply voltage peak synchronous square wave generator utilizing a power rectification waveform; Including the
The step of supplying a power factor limit control signal to the signal passage controller
Adjusting a pulse width of the square wave generator by a pulse width controller; And
Supplying an operating power source including a bias voltage and a reference voltage of components constituting the electric leakage screening device by the power factor limit;
Supplying a pulse signal only at a voltage higher than a voltage obtained by multiplying a peak power supply voltage by a power factor in a power supply voltage (+) period;
Further comprising a power factor limiter.

delete